Impedance spectroscopy of vanadium modified BaBi2Nb2O9 ceramics Malgorzata Adamczyk, Lucjan Kozielski, Dariusz Bochenek, Daria Radoszewska, Marian Pawełczyk and Beata Wodecka-Duś Eur. Phys. J. B, 89 2 (2016) 37 Published online: 10 February 2016 DOI: 10.1140/epjb/e2016-60407-2